Another theme is the idea of redemption and healing. Sirius has a lot of emotional baggage from his past, and Luna, with her kind heart and unique view of the world, can often be written as a catalyst for his healing process. It's about how they can help each other grow and move forward in the wizarding world.
One popular fanfiction might be 'The Unlikely Alliance'. It beautifully weaves together the unique personalities of Luna and Sirius. In this story, they team up to solve a mystery within Hogwarts that the other characters have overlooked. Their different perspectives, Luna's dreamy and perceptive nature and Sirius's rebellious and protective side, make for an interesting dynamic.
One common theme is the exploration of their unique friendship. Their personalities are so different yet complementary, and fanfictions often focus on how they understand and support each other. Another theme is the discovery of hidden magic. Luna has such a different view of magic, and when paired with Harry, they often go on quests to find new and strange magical elements. And of course, there's the theme of love in some fanfictions, whether it's a budding romantic love or a deep platonic love.
One common theme is the exploration of their outcast status. Both Luna and Theodore are somewhat on the fringes in the Hogwarts social scene. Fanfictions often bring them together through this shared sense of being different. For example, they might bond over their unique magical interests that others don't understand.
One common theme is the exploration of their shared experiences. Since they both have unique outlooks in the wizarding world, fanfictions often show how they bond over things like seeing thestrals or believing in less - known magical creatures.
The theme of mentorship also comes up frequently. Sirius Black, with his wealth of knowledge and experience, is often depicted as a mentor figure to Lily Luna Potter. This can involve teaching her about magic, helping her deal with the challenges of being a Potter in the wizarding world, or guiding her through moral and ethical dilemmas.
One common theme is their unique family dynamic. Given Luna's rather odd upbringing by Xenophilius, many fanfictions explore how this influenced Luna's personality. Another theme could be their relationship with the wizarding community at large. Since they are both rather eccentric, stories might focus on how they interact with more 'normal' wizards.
The theme of freedom is quite important too. Sirius was locked up in Azkaban for a long time, and when he escaped, he was fighting for his freedom. Fanfictions often expand on this, showing his journey to fully regain his freedom and his place in the wizarding world, while also dealing with the prejudice against him because of his supposed crimes.
One common theme is friendship. Since they are both characters from the Harry Potter series, many fanfics explore how their friendship might develop. Another theme could be adventure. They could go on adventures together in the wizarding world. Also, there might be themes related to self - discovery, as they both grow and learn more about themselves in the company of each other.
The theme of redemption also shows up. Since Sirius had a somewhat 'tainted' reputation in the eyes of the Black family, some fanfictions explore if Orion could have played a role in his redemption or if Sirius could have redeemed the family name in Orion's eyes.
One common theme is family. Since Sirius comes from the Black family, stories often explore how his child is related to the family's complex history, traditions, and dark secrets.